631912844429 has 2 divisors, whose sum is σ = 631912844430. Its totient is φ = 631912844428.

The previous prime is 631912844417. The next prime is 631912844443. The reversal of 631912844429 is 924448219136.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440351688100 + 191561156329 = 663590^2 + 437677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631912844429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631912844029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315956422214 + 315956422215.

It is an arithmetic number, because the mean of its divisors is an integer number (315956422215).

Almost surely, 2^631912844429 is an apocalyptic number.

It is an amenable number.

631912844429 is a deficient number, since it is larger than the sum of its proper divisors (1).

631912844429 is an equidigital number, since it uses as much as digits as its factorization.

631912844429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 53.

The spelling of 631912844429 in words is "six hundred thirty-one billion, nine hundred twelve million, eight hundred forty-four thousand, four hundred twenty-nine".